Die and blank holding means



Aug. 18, 1925. v

o. G. NlLsoN ET AL DIE AND BLANK HOLDING MEANS Aug. 18, 1925.

. 1,550,387 o. G. NILSON ET Al.

DIE AND BLANK HOLDING MEANS Fii'ed April so. 1925' 3 Sheets-Shea*l 2 W lnJ 3 Sheets-Sheet I5 O. G. NILSON ET AL Filed April 30. 1923 l DIE AND BLANK HOLDING MEANS Aug. 18, 192.5.

, a given size Patented Aug..- 18, 1925.r

UNiTED. STATES :PATENT oFFlcE.

OLOF G. NILSON AND RUDOLPH W. GLASNEB, O CHICAGO, ILLINOIS, ASSIGNOBS TO 'MABQUETTE TOOL MANUFACTURING CO., OEE CHICAGO, ILLINOIS, A CORPORATION OI' ILLINOIS.

DIE Nn BLANK Homme Mimes.A

Application led April 8 0, 1923*. Serial No. 685,754.

the objects of the invention is to provide anv imroved die and blank ,holder which will ma e it possible to draw metal shells of various sizes and shapes to a greater depth in 15 one operation ofthe press thanwas .heretofore possible.

has not been possible to draw metal in one operation beyond a given depth relative to of sheet. It is only by the re- Idrawing of the partially formed article by means of separate steps and operations of the machine that it is possible to reduce the diameter and increase the depth of the shell.

In order to obtain a shell of a smaller diam.-

eter and greater length in oneoperation of the press, and in order to reduce the handling of the material and the labor necessary in connection therewith, is one of the objects of the present invention.

A further object is to provide an irnroved blank holding means which will alow an application of varying pressures against the metal to be drawn into-.a shape during the different stages of the operation, thereby rendering it4 possible, to form. or shape the article in a pluralityA of clearly defined steps during one cycle of operation of the machine.

40 y A further object is to perform these operations in one stroke of the press on a t pe of machine which heretofore, without t e apv lication of the plresent invention, would Vnot e'adapted for t is work.

A further object is to make' it possible to apply this invention to a standard type of ress without in any way altering the press y the`application of the present invention.

A further object is' to provide improved means for exerting pressure on a metal blank to be formed into a shape, the amount of pressure of which may be predetermined and varied at will during the different stages of one cycle of operation.

A further object is to provide an improved die construction which will cut the blank to the desired shape out of the sheet and form a shape of desired' dimensions, without removing the shell from the die, and then reform the shell thus shaped into aiinal shape during one cycle of operation of the press.

A further object is to provide an improved die and draw ring by the use of which a single shell may be given twoV different and distinct shapes during one cycle 0 Vof operation. Heretofore and in practical experience it To the attainment of these ends and the accomplishment of other new and useful objects as will appear, the invention consists in the features of novelty in substantially the construction, combination and arrangement of the several parts hereinafter more fully v described and claimed and shown in the ac-` companying drawings illustrating this invention, and in which p Figure 1 is a view in longitudinal section of a portion of a draw press havin a die and blank holding means constructe in accordance with the principles of this inven-4 tion applied thereto and showing the parts in their normal or initial positions.

Figure 2 is a view similar to Figure 1, showlng the parts in another position or the positions they will assume during the first step of the forming operation.

igure 3 is a view similar to Figure 2, showing the position the parts will assume at the completion of the final forming step.

Referring more particularly to the drawings, the numeral 10 designates a supporting plate or bolster of a draw press an designates a reciprocating die which latter is adapted to be reciprocated in the ordinary and well-known man-ner in machines of this character;

Supported by the bolster plate is a die shoe 12, which latter holds the die or Iforming block 13. The forming block may be of any desired size and configuration according to the article to be shaped.

1 Encompassing the forming block 13 is an annular member 14, having a cutting edge 15, which latter co-operates with the edge' 16 of the reciprocating die 11 to cut the material into proper shape. y

The die 11 is provided with a recess 17 opening through the end 18 thereof and the l recess is reduced in. size as at 19 to form a shoulder 20 spaced from the edge 18.

Within the recess 19 is arranged a suitable knock out member 21` which may be operated in any desired or suitable manner such as by means of a pin 22 connected any desired size and configuration and disposed within the cylinder 23 and spaced from the wall thereof to form a fluid pres.

sure space 24 is another cylinder 25, prefwell-known construction,

erably provided with a partition 26 dividing the same into two chambers 27-28. Reciprocable in the\cylinder 23 is a piston 29, having a portion 3() which is adapted to reciprocate within the space 24 between the cylinders. Fluid pressure is supplied to the cylinder 23 through a suitable opening 32 and from any suitable source through a supply pipe 33. Arranged within the supply pipe 33 is a pressure controlling and regulating valve 34, of any ordinary and by means of which the fluid pressure in the space 24 may be controlled at will.

The piston 29 is preferably provided with an aperture 35 therethrough so that the portion 36 of the cylinder 23 above the piston 29 will have communication with the atmosphere to maintain atmospheric pressure in the space 36.

Arranged within the chamber 27 is a pist0n 37 and a piston 38 is arranged' with the chamber 28 of the inner cylinder. These pistons are connected by means of a suitable piston or connecting rod 39,' which latter is adapted to reciprocate through a suitable opening in the partition 26 and suitable packing 40 is arranged toprovide a fluid tight joint.

Passing through the piston rod 39 is a passage 41, which forms communication between the chambers2728 ofthe cylinder 25 on the pressure sides of the pistons 37-38. A second passage 42 also passes through the piston or connecting rod 39 and through the piston 38 so as to form communication between the cylinders 27--28 on. the other or atmospheric side of the pistons.

The pistons 37-38 operate in unison and are adapted to be raised by means of iuid pressure, the fluid being supplied preferably to the chamber 27 through a suitable opening 43, and by means of a suitable pipe 44 receiving its supply from any suitable source. Arranged within the pipe line 44 is a pressure regulating and controlling valve 45 of any desired and well-known construction and by means of the use of which the pressure in the chambers 27-28 may be varied or controlled at will.

The top of the chamber 28 is preferably open and any suitable means may be provided for limiting the upward movement of the pistons 37-38, such for instance as stops 47.

Encompassing the forming block 13 is a blank holding ringf48 which is supported preferably by means of a suitable plate 49, and which plate rests upon the ends of suitable supporting pins 50, any number of which pins may be provided. These pins 50 pass loosely through the die shoe 12, bolster plate 10 and piston 29 and engage and rest upon the upper surface of the piston 38 in the chamber 28 and the plate.

' Encompassing the blank holding ring 48 is a second blank holding ring 51, whichI latter is supported by means of suitable pins 52, any number of which pins may be provided. These pins l52 pass loosely through the die shoe 12 and bolster 10 and engage and rest upon the upper surface of the piston 29.

The draw or blank holding ring 51 is prefL y ably provided with a circumferential shoulder 53 adapted to engage a shoulder 54 on the member 14 for limiting the upward movement of the ring 51. The outer ring 51 is adapted to be moved against the stress of the fluid pressurein the space 24 of the cylinder 23, by the engagement of the lower edge 18 of the die member 11, when the latter is depressed while the inner ring or member 48 is adapted t0 be moved against the stress of the fluid pressure in the chambers 27-28 by the engagement of the shoulder 2O of the die 11 against the work when the die 11 is depressed. It will be manifest that during `the operation the end 18 of the die 11 will contact with a portion of the work to partially shape the article 55 by deflecting the periphery 56 of the article over the forming block 13 and the inner draw ring or member 48, as shown in Figure 2, and during this operation the member 48 will be held against movement with respect to the forming block 13, while the draw ring or member 51 is being lowered by the lower" .Huid pressure in the cylinders 274-28 so that the article will be formed in two clearly defined steps during one cycle of operation of the machine.

The space between theshoulder 2O and the upper edge of the. draw ring or member 48 may be so proportioned as to produce the desired gripping effect upon the adjacent p ortions of the -material of the article'so as to permit the periphery 56 of the articleto be shaped as shown in Figure2, without danger of injuring the material.

Obviously the pressures in the space'24 and the cylinder 23 andin the chambers 27--28 may be varied and proportioned according to the requirements of the work being operated upon.

It isthought 'that the operation will be clearly understood from the foregoing but briefly stated it is as follows. v

-The normal or initial position of the parts is as shown in Figure 1, that is with the die 11 elevated and with the draw or' blank holding rings 48-51 in a position that their upper faces will be Hush with each other and flush with the top of the forming block 13, it being of course understood that the fluid in the cylinders which is operating against the respective pistons is of the desired or necessary relative pressures.

The material is then placed upon the forming block so as to extend across and rest upon the upper surfaces of the blank holding or gripping members 48-51.

The die 11 is then lowered and the' first operation will be th'e shearing or cutting off means of the material to the proper shape iX s the die the cutting edges 15 and 16.

continues to descend the edge 18 will depress,

the portion 56 of .the-article and shape the same over the forming block 13 and holding ring ring 48. At the same time the ring 51 will be lowered to the position shown in Figure 2. As the ring 51 reaches the position shown inFigure 2, the shoulder 20 of the die co-operates with the upper surface of the ring or member 48 to grip the material therebetween and a further lowering of the die will depress the portion of the material in contact .with the shoulders 20 so as to -bend the article 55 over the forming block This will complete-the formation of the article after which the die 11 recedes or is elevated and during this elevation the shaped article will be located in the recess 19 in -the die and will ascend therewith. At the proper time the knockout member is operated to eject the completed article.

While the preferred form of the invention lhas been herein shown and described, it is to be understood that various changes may be made in the details of construction and 1n the combination and arrangement of the several parts, within the scope of the claims,

upon the blank holding means, one of the said blank holding means being rendered inactive in advance of the other of the blank holding means. v

2. A draw press block, a reciprocable shaping embodying a forming member cooperating therewith, a plurality of separate A `blank holding means for the material to be formed operable independently ofeach-other and against the same face of the material, and fluid pressure means perating upon the blank holding means, one of the said blank holding means being rendered inactive in advance yof the other of the blank holding means.

3. A draw press embodying a forming.A

block', a `reciprocable shaping member cooperating therewith, a plurality of separate blank holding means for the material to be formed, and fluid pressure means individual to the blank holding means operating upon the blank holding means, one of the said blank holding means being rendered vinactive in advance of the other. of the blank holding means.

4. A draw press block, a reciprocable shaping member cooperating therewith, a plurality of separate blank holding means for the material to be formed, Yand fluid pressure means' operating upon the blank holding means, one of the said blank holding means being rendered inactive in advance of the other of the blank holding means and during one cycle of operation of the press.

5. A draw press embodying a forming block, a reciprocable shaping member vcooperating therewith, and fluid pressure blank holding means for the material-to be formed, the said blank holding means' cooperating with the said block and embodying mechanism operating to permit the blank to be shaped into a shell during a portion of one cycle of operation of the press, said blank holding means also embodying -embodying a forming.

mechanism operating to permit the depth y of the shell to be increased during' another portion of the same cycle of operation of during a portion of one cycle of operation of the press, said blank holding means also embodying mechanism operating to permit the depth of the shell to be increased during another portion of the same cycle of operation of the press, and fluid pressure means operating upon the said mechanisms.

7. A draw press embodying a forming block, a reciprocable shaping member cooperating therewith, blank holding means for the material to be formed, the said blank holding means co-operating with the said block and embodying mechanism operating lto permit the blank to be shaped into a shell during a portion of one cycle of o'peration of the press, said blank holding means also embodying mechanism operating. to permit the depth of the shell to be increased during another portion of the same cycle of operation of the press, and fluid pressure means individual to and operating upon the said mechanisms. v

8. A draw press embodying a forming block, a reciprocable shaping member cooperating therewith, a plurality of blank holding means for the material to be formed, and fluid pressure means operating upon the said blank holding means, the said blank holding means being roperable against the stress of the fluid pressure means, one in advance of the other whereby the blank will be given its final shape by a plurality of clearly defined steps of operation during one cycle of operation of the press. y

9. A draw press embodying a forming block, a reciprocable shaping member co-operating therewith, a.y plurality of blank holding means for the material to be formed, a fluid pressure means operating upon the said blank holding means, the said blank holding means being operable against the stress of the fluid pressure means, one in advance of the other whereby the blank will be given its final shape by a plurality of clearly defined steps of operation during one cycle of operation of the press, and means for controlling at will the stress of the said fluid pressure means upon the respective blank holding means.

10. A draw press embodying a forming block, a reciprocable shaping member cooperating therewith, a plurality of blank holding means for the material to be formed, and fluid pressure means individual to and operating upon the said blank holding means, the said blank holding means being operable against the stress of the respective fluid pressure means, one in advance of the other whereby the blank will be given its final shape by a plurality of clearly defined steps of operation during one cycle. of operation of the press.

11. A draw press embodying a forming b1ock,`a reciprocable shaping member cooperating therewith, a plurality of blank holding means for the material to be formed, and fluid pressure means individual to and operating upon the said blank holding means, the said blank holding means being operable against the stress of the respective fiuid pressure means, one in advance of the other whereby the blank will be given its final shape byl a plurality of clearly defined steps of operation during one cycle of operation of the press, one of the said fluid pressure means encompassing the other and being out of direct communication with each other.

12. A draw press embodying a forming block, a reciprocable shaping member cooperating therewith, a plurality 'of blank holding means for the material to be formed, one of the said blank holding means encompassing the other, and fluid pressure means operating upon the said blank holding means, the said blank holding means being operable against the stress of the fluid pressure means, one in advance of the other whereby the blank will be shaped over the said block by a plurality of clea'rly de-y fined steps of operation during one cycle of operation of the press.

13. A draw press embodying a forming block, a reciprocable shaping member co-operating therewith, a plurality of blank holding means for the material to be formed, one of the said blank holding means encompassing the other', fluid pressure means operating upon the said blank holding means, the said blank holding means being operable against the stress of the fluid pressure means, one in advance of the other whereby the blank will be shaped over the said block by a plurality of clearly defined steps of operation ,during one cycle of operation` of the press, and means whereby a different stress of fluid pressure may be exerted upon each of the said blank holding means.

14. A draw pressembodying a forming block, a reciprocable shaping member co-operating therewith, a plurality of blank holding means for the material to be formed, one of' said blank holding means encompassing the other and both encompassing the said block, and fluid pressure means indiadvance ofthe other during one cycle of operation of the press, and means for varying at will the stress of either of the said fiuid pressure means.

16. A draw press embodying a forming block, a reciprocable shaping member cooperating therewith, and a plurality of fluid pressure means operating on the blank to be drawn, said iiuid pressure means causing diierent pressures to be exerted upon the said blank during di'erent stages in the operation of the press. 1

17. A draw press embodying a forming block, a areciprocable shaping member cooperating therewith, a plurality of fluid pressure means operating on the blank to be drawn, said fluid pressure means causing different pressures to be exerted uponr the said blank during dierentstages'in the operation of the press, and means whereby the said pressures may be varied at will.

18. A draw press embodying a forming block, a reciprocable. shapingl member cooperating therewith, a plurality of` blank holding mea-ns for the material to `be formed, and fluid pressure means operating on`the`blank holding means, the said fluid pressure means causing different pressures to be exerted upon the. said blank holding meansv during Vdlierent stages in the operation of the press. x

19. A draw press embodying a forming block, a reciprocable shaping member 'cooperating therewith, a pluralityof blank holding means or the material to be formed, fluid ressure means operating on the blank holdlng means, the said uid pressure means causing diiferent ressures to be exerted upon'the said blank olding means during diierent stages in the operation of' the press, and means whereby the said pressures may be varied at will.

20. A draw press embodying a ormng block, a reciprocable shaping member co-operating therewith, and a plurality of means operating upon the blank to hold the same, the said means oausingdiierent pressures to be` exerted upon the said blank during dii'erentstages in the operation of the press.

21. A draw press embodying a forming block, a reeiproeable shaping member oooperating therewith, a plurality of means operating upon the blank to hold the same,

`the said means causing diierent pressures -to be exerted upon the said blank during different stages in the operation of the press, and means whereby the said1 pressure may be varied. at will.

Y. 22. A draw press embodying a forming",

block, a` reeiprocable shaping member cooperating therewith, a plurality of blank holding means for the material to be formed, and means operating upon the blank holding-means with different pressures during different stages in the operation of the press. Y

23. A draw press embodying a forming block, a. reoiprocable shaping member cooperating therewith, a plurality of blank holding means for the material to 'be formed, means operating upon the blank holding means with different pressures during different stages in the operation of the press, and means whereby` the said pressure l imay be .varied at will.

In ltestimony whereof we havesigned our names'to this specification, on this 13th day of April, A.` D. 1923.

, oLoF G. NILsoN. i

RUDOLPH w. GLAsNER; 

